.app-shell {
  min-height: 100vh;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(220px, auto) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--sz-space-4);
  min-height: 64px;
  padding: 0 var(--sz-space-5);
  border-bottom: 1px solid var(--sz-color-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.app-layout {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr) 390px;
  min-height: calc(100vh - 64px);
}

.section-nav {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow: auto;
  border-right: 1px solid var(--sz-color-border);
  background: rgba(251, 252, 254, 0.96);
  padding: var(--sz-space-4);
}

.builder-workspace {
  min-width: 0;
  padding: var(--sz-space-5);
  overflow: auto;
}

.workspace-panel {
  max-width: 1080px;
  margin: 0 auto;
}

.live-preview {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow: auto;
  border-left: 1px solid var(--sz-color-border);
  background: rgba(251, 252, 254, 0.98);
}